CKD SWD Series User manual

Brand: CKD

Model: SWD Series

Type: User manual

INSTRUCTION MANUAL

• Read this Instruction Manual before using the product.

• Read the safety notes carefully.

• Keep this Instruction Manual in a safe and convenient place for future reference.

Weir Diaphragm Valve

SWD Series

SM-50769-A/3

SM-50769-A/3 SAFETY INFORMATION

i 2022-01-06

PREFACE

Thank you for purchasing CKD's "SWD Series " Weir Diaphragm Valve.

This Instruction Manual contains basic matters such as installation and usage instructions in order to

ensure optimal performance of the product. Please read this Instruction Manual thoroughly and use the

product properly.

Keep this Instruction Manual in a safe place and be careful not to lose it.

Product specifications and appearances presented in this Instruction Manual are subject to change

without notice.

• The product, which uses control valves such as solenoid valves, motor valves, and air operated

valves, is intended for users who have basic knowledge about materials, fluids, piping, and

electricity. CKD shall not be responsible for accidents caused by persons who selected or used

the product without knowledge or sufficient training with respect to control valves.

• Since there are a wide variety of customer applications, it is impossible for CKD to be aware of all

of them. Depending on the application or usage, the product may not be able to exercise its full

performance or an accident may occur due to fluid, piping, or other conditions. It is the

responsibility of the customer to check the product specifications and decide how the product shall

be used in accordance with the application and usage.

SM-50769-A/3 SAFETY INFORMATION

ii 2022-01-06

SAFETY INFORMATION

When designing and manufacturing any device incorporating the product, the manufacturer has an

obligation to ensure that the device is safe. To that end, make sure that the safety of the machine

mechanism of the device, the pneumatic or water control circuit, and the electric system that controls

such mechanism is ensured.

To ensure the safety of device design and control, observe organization standards, relevant laws and

regulations, which include the following:

ISO 4414, JIS B 8370 (the latest edition of each standard)

In order to use our products safely, it is important to select, use, handle, and maintain the products

properly.

Observe the warnings and precautions described in this Instruction Manual to ensure device safety.

Although various safety measures have been adopted in the product, customer's improper handling

may lead to an accident. To avoid this:

Thoroughly read and understand this Instruction Manual

before using the product.

To explicitly indicate the severity and likelihood of a potential harm or damage, precautions are

classified into three categories: "DANGER", "WARNING", and "CAUTION".

DANGER

Indicates an imminent hazard. Improper handling will cause death or serious

injury to people.

WARNING

Indicates a potential hazard. Improper handling may cause death or serious

injury to people.

CAUTION

Indicates a potential hazard. Improper handling may cause injury to people

or damage to property.

Precautions classified as "CAUTION" may still lead to serious results depending on the situation.

All precautions are equally important and must be observed.

Other general precautions and tips on using the product are indicated by the following icon.

Indicates general precautions and tips on using the product.

SM-50769-A/3 SAFETY INFORMATION

iii 2022-01-06

Precautions on Product Use

Precautions on Product Disposal

CAUTION

When disposing of the product, comply with laws pertaining to disposal and cleaning of

wastes and have an industrial waste disposal company dispose of the product.

WARNING

The product must be handled by a qualified person who has extensive knowledge and

experience.

The product is designed and manufactured as a device or part for general industrial machinery.

Use the product within the specifications.

The product must not be used beyond its specifications. Also, the product must not be modified

and additional work on the product must not be performed.

The product is intended for use in devices or parts for general industrial machinery. It is not

intended for use outdoors or in the conditions or environment listed below.

• In applications for nuclear power, railroad system, aviation, ship, vehicle, medical equipment,

and equipment that directly touches beverage or food.

• For special applications that require safety including amusement equipment, emergency shut-

off circuit, press machine, brake circuit, and safety measures.

• For applications where life or properties may be adversely affected and special safety

measures are required.

(Exception is made if the customer consults with CKD prior to use and understands the

specifications of the product. However, even in that case, safety measures must be taken to

avoid danger in case of a possible failure.)

Do not handle the product or remove pipes and devices until confirming safety.

• Inspect and service the machine and devices after confirming the safety of the entire system.

Also, turn off the energy source (air supply or water supply) and power to the relevant facility.

Release compressed air from the system and use extreme care to avoid water or electric

leakage.

• Since there may be hot or live parts even after operation has stopped, use extreme care when

handling the product or removing pipes and devices.

• When starting or restarting a machine or device that incorporates pneumatic components,

make sure that a safety measure (such as a pop-out prevention mechanism) is in place and

system safety is secured.

SM-50769-A/3 SAFETY INFORMATION

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Precautions on Design and Selection

WARNING

If it is necessary to function as a safety valve such as an emergency shut off valve, take

other measures to ensure safety.

For equipment selection and handling, it is the customer’s responsibility to check the

specifications of this product.

Incorrect equipment selection and handling can cause problems not only in this product, but also

to your system.

Take measures to prevent physical harm or property damage in the event of failure of this

product.

Follow the precautions below regarding the surrounding environment.

• Check the compatibility of product component materials and the atmosphere.

• Make sure that no fluid adheres to anything other than the flow path of the product.

• Use within the ambient temperature range described in the specifications.

• Do not use in places affected by vibration or shock, around heat sources, or outdoors.

If the liquid ring circuit, install a release valve.

When the valve opens and closes, the diaphragm moves up and down, which causes the flow path

capacity to change inside the valve. For this reason, if the fluid is an incompressible fluid (liquid),

extreme pressures will be created in the valve when operating under conditions that seal the fluid

in the valve (liquid ring). In this case, install a release valve on the primary or secondary side of

the valve, preventing a liquid ring circuit from forming.

Follow the precautions below depending on working fluids.

• Check the compatibility of product component materials and working fluids.

• Iron rust and debris in the fluid can cause operation faults or leaks and deteriorate product

performance. Provide measures to remove foreign matter.

• When hot fluid flows during steam sterilization, the valve body becomes hot, so do not touch

with your hand or body. There is a risk of burns if these are touched directly.

Also, be careful not to place anything that may deteriorate, melt, or ignite nearby.

• While the upper side of the diaphragm (actuator side) does not come into contact with the

fluid, due to changes in fluid and fluid temperature, fluid may permeate and turn into fluid

atmosphere.

• Fluids that contain particles, such as slurries and UV hardeners, or that may solidify or gel,

can affect performance.

Use at the fluid temperature described in the specifications.

Use at the working pressure described in the specifications.

SM-50769-A/3 CONTENTS 
  v  2022-01-06 
CONTENTS 
 
PREFACE ........................................................................................................................... i 
SAFETY INFORMATION .................................................................................................. ii 
Precautions on Product Use ...................................................................................... iii 
Precautions on Product Disposal .............................................................................. iii 
Precautions on Design and Selection ....................................................................... iv 
CONTENTS ....................................................................................................................... v 
PRODUCT OVERVIEW ............................................................................................. 1 
1 Model Number Indication .................................................................................... 1 
2 Internal Structure, Dimensions ........................................................................... 2 
3 Product Specifications ........................................................................................ 3 
4 Operation Explanation ........................................................................................ 4 
INSTALLATION ......................................................................................................... 5 
1 Before Installation ............................................................................................... 5 
2 Environment ........................................................................................................ 6 
3 Mounting ............................................................................................................. 7 
4 Piping .................................................................................................................. 8 
4.1 Seal material ....................................................................................................... 9 
USAGE ..................................................................................................................... 10 
1 Checks to Make Before Use (Checks Made After Mounting) ............................11 
2 Safety Instructions ............................................................................................ 12 
MAINTENANCE AND INSPECTION ....................................................................... 13 
1 Maintenance Parts ............................................................................................ 13 
2 Disassembling and Assembling ........................................................................ 14 
TROUBLESHOOTING............................................................................................. 16 
1 Problems, Causes, and Solutions .................................................................... 16 
WARRANTY PROVISIONS ..................................................................................... 17 
1 Warranty Conditions ......................................................................................... 17 
2 Warranty Period ................................................................................................ 17 
 

SM-50769-A/3 1. PRODUCT OVERVIEW

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1. PRODUCT OVERVIEW

1.1 Model Number Indication

SM-50769-A/3 1. PRODUCT OVERVIEW

2 2022-01-06

1.2 Internal Structure, Dimensions

NC NO Double acting

SWD1※8-F 90 99.5 22 60 734 10.5 32 40

SWD1※-10-F 90 101 22 61.5 7 34 14 32 40

SWD2※-15-F 108 130 22 73 8.5 34 17.5 38 46.5

SWD3※-25-F 127 170 24 84 12.5 50.5 23 49 56 2.7 2.3 2.3

SWD4※-40-F 159 212 28 97 16.5 50.5 35.7 57 66 5.1 4.1 4.0

SWD5※-50-F 190 241.5 47 118 23 64 47.8 76.5 87.5 9.5 7.8 7.5

1.2

0.6

Weight [kg]

Model No.

No. Part name

1 Cylinder guard ADC12 Aluminum die-casting

2 O-ring FKM Fluoro rubber

3 Indicator SUS304 Stainless steel

4 Spring SUS304（or SWP、SWOSC）Stainless steel（or Piano wire, oil temper wire）

5 Piston A2017 Aluminum

6 Piston rod SUS304 Stainless steel

7 Rod cover,yoke ADC12 Aluminum die-casting

Hexagon socket

head cap screw

SUS304、SUSXM7 Stainless steel

9 Compressor SCS13 Stainless steel

10 Diaphragm

PTFE、EPDM

SUS303、SUS304

Fluoro resin, ethylene propylene rubber,

stainless steel

11 Body SUS316L Stainless steel

Material

SM-50769-A/3 1. PRODUCT OVERVIEW

3 2022-01-06

1.3 Product Specifications

SWD※1 SWD※2 SWD※3

Normally closed Normally open Double acting

MPa

℃

Frequency

Mounting orientation CAUTION 1

Operating port

Operating fluid

SWD1※-8

SWD1※-10

SWD2※-15

SWD3※-25 0.3 to 0.35 0.25 to 0.3

SWD4※-40 0.35 to 0.4 0.3 to 0.35

SWD5※-50 0.27 to 0.32 0.2 to 0.25

SWD1※-8

SWD1※-10

SWD2※-15

SWD3※-25

SWD4※-40

SWD5※-50 50

CAUTION 1：For horizontal piping, piping at the angles shown in Table 1 on page 7 minimizes valve fluid pooling.

Diaphragm

PTFE/EPDM

Material

Body

SUS316L (buff polishing #400 or equiv.,electrolytic polishing)

Actuator

ADC12（fluoro resin coating）

2.6

Rc1/8

Air

0.4 to 0.7

0.35 to 0.7

Operating

pressure

MPa

0.25 to 0.35

0.2 to 0.3

2.3

4.5

Unrestricted

5 to 90(during steam sterilization 130）

0 to 60

SWD1 to SWD4：20 or less

SWD5：10 or less

0 (at water pressure)

Fluid temperature

Ambient temperature

cycle/min

Valve seat leakage cm3/min

Water, pure water, chemical liquids (fluids that do not corrode wetted part

Working pressue

0 to 0.6

2.0

Proof pressure (at water pressure)

Working fluid

Item

Actuation

SM-50769-A/3 1. PRODUCT OVERVIEW

4 2022-01-06

1.4 Operation Explanation

1、 Normally closed ― Connect the operating air to the X port.

When opened When closed

2、Normally open ― Connect the operating air to the Y port.

When opened When closed

３、 Double acting ― Connect the operating air to the X and Y ports.

When opened When closed

When air is applied to the

X port, the piston rises,

the diaphragm connected

to the piston also rises at

the same time, the weir

opens and the fluid flows.

When air in the X port is

exhausted, the force of

the spring lowers the

piston, and the diaphragm

connected to the piston

also lowers at the same

time, closing the weir and

sealing the fluid.

When there is no air in

the Y port, the force of

the spring raises the

piston, the diaphragm

connected to the piston

also rises at the same

time, the weir opens

and the fluid flows.

When air is applied to

the Y port, the piston

goes down and the

diaphragm connected to

the piston goes down at

the same time, closing

the weir and sealing the

fluid.

When air is pressurized

to the X port and air is

exhausted from the Y

port, the piston rises, the

diaphragm connected to

the piston also rises at

the same time,

the weir opens

and the fluid flows.

When air is pressurized to

the Y port and exhausted

from the X port, the piston

goes down, and the

diaphragm connected to

the piston also goes down

at the same time, closing

the weir and sealing the

fluid.

SM-50769-A/3 2. INSTALLATION

5 2022-01-06

2. INSTALLATION

2.1 Before Installation

CAUTION

Do not remove the piping port protector and do not take the product out of the plastic bag

until just before piping.

If the piping port protector is removed or the product is taken out of the plastic bag before ready

to begin piping, foreign matters may enter from the piping ports and cause a failure or

malfunction.

Do not disassemble the valve before installation.

Even within the warranty period, disassembly for purposes other than maintenance and inspection

may not be covered by the warranty.

In addition, there is a risk of causing problems due to foreign matter being mixed in.

• Check that the product model number you ordered and the model number displayed on the product are

the same.

• Check that there are not abnormalities in the product such as damage to the outside of the product or

loose bolts.

• When storing, store it in a box so that foreign matter does not get inside the valve, and remove it from

the box when piping.

SM-50769-A/3 2. INSTALLATION

6 2022-01-06

2.2 Environment

WARNING

Consult CKD about the specifications before using the product outside the designated

specifications or for special applications.

Do not use this product in the presence of corrosive gas or solvents.

Do not use this product in an environment where corrosive gases such as sulfur dioxide gas or

solvents are present.

Do not use this product in a humid environment.

Condensation may occur due to a change in the temperature.

Do not use this product near a heat generating source or in a location where it may be

exposed to radiant heat.

Use this product within the specified ambient temperature range.

CAUTION

Protect the valve so that dust does not get inside.

If there are high levels of dust in the area, install a downward-facing silencer or elbow fitting on the

exhaust port of the valve operating part so that dust does not enter.

• When using this product in a cold climate, take the necessary measures to prevent freezing.

• This product cannot be used outdoors. Protect the product by installing it inside a cover or a

case.

• Do not use this product in an environment where vibration or inertia is applied.

SM-50769-A/3 2. INSTALLATION

7 2022-01-06

2.3 Mounting

WARNING

Mounting and piping should be done after thoroughly reading this Instruction Manual by a

person who has a thorough understanding of safety precautions such as the system, fluid

characteristics, and compatibility of fluids with related components.

Incorrect mounting and piping may cause not only troubles of this product but also system

troubles of the customer, and may lead to death or serious injury of the user.

CAUTION

Thoroughly read and understand this Instruction Manual before mounting the product.

Hold the body firmly when handling and mounting the product.

After mounting, check for leaks in the piping and check the valve is mounted correctly.

This product may be heavy depending on the port size.

When mounting, piping, and removing, handle with care, such as taking measures to prevent

injury due to dropping.

• For horizontal piping, liquid accumulation in the valve can be minimized (see Table 1, Fig. 1)

by tilting the valve and piping. Pipe so that the “-CKD-” mark stamped on the body piping

section is directly above.

• Secure enough space in consideration of safety work during maintenance and

troubleshooting.

Table 1. Port size and valve tilt angle

Model No. Port size

Valve tilt angle（θ°）

SWD1※8-F 8A 23

SWD1※-10-F 10A 11

SWD2※-15-F 15A 14

SWD3※-25-F 25A（1S）25

SWD4※-40-F 40A（1.5S）24

SWD5※-50-F 50A（2S）23

(Fig. 1) Valve tilt angle

“-CKD-”

SM-50769-A/3 2. INSTALLATION

8 2022-01-06

2.4 Piping

CAUTION

Secure the product when tightening or piping again.

When installing piping, avoid any application of stress on the valve body, such as bending,

tension, or compression.

Secure and support the pipes to prevent the valve from being subjected to pipe loads and

vibrations directly.

When piping the operation part, tighten with the recommended torque (see Table 3).

Do not use excessive seal material (seal tape, jelly-like seal material) when piping the

operation part.

It may enter inside the actuator and cause a malfunction.

Install a bypass circuit to facilitate maintenance and repair work.

Do not apply high pressure suddenly when supplying fluid for the first time after connecting

the pipes.

If the pipes are not secured properly, it may lead to accidents such as a pipe disconnection or a

fluid leakage.

Pipe cleaning

・Before piping the product, be sure to flush it to remove foreign matter such as debris, metal chips,

rust, and sealing tape.

Removal of foreign matters

・Debris or foreign matter in the fluid may prevent the valve from functioning correctly. When there is

contamination, install a filter on the primary side of the valve according to the circuit used.

Piping of operation port

・Piping the operation port as shown in Table 2.

・The set screw attached to the breathing port of NC and NO actuators is a part to prevent erroneous

piping, so it can be used as it is. However, in places where water drops, etc., remove the set screw

and take appropriate protective measures such as piping the elbow fitting downward to prevent water

from entering.

・The breathing port should be open to the atmosphere.

If there is a problem with the scattering of dust due to the exhaust to the surroundings, remove the

set screw, pipe it, and let the air in and out in a place that does not matter. If there are high levels of

dust in the area, it may cause malfunction or leakage. Attach a silencer or filter to the breathing port.

・Select the operating solenoid valve to be connected to the operation port according to the

specifications and application.

・When piping to the operation port, be sure to secure the operation port with a spanner or vise and

screw it in.

Refer to Table 3 for the tightening torque during piping.

・Compressed air contains a large amount of drainage such as water, oxidized oil, tar , and foreign

matters. Such drainage my cause a significant reduction in the accuracy of the pneumatic component.

Take measures against drainage (such as dehumidifying with an aftercooler or a dryer, removing

foreign matters with an appropriate filter, or installing a tar removing filter).

SM-50769-A/3 2. INSTALLATION

9 2022-01-06

Table 2. Operation port and breathing port according to actuation

Model No.

Actuation

Operation port

Breathing port

SWD※1-※-F

Normally closed

X port

Y port

SWD※2-※-F

Normally open

Y port

X port

SWD※3-※-F

Double acting

Open：X port

Close：Y port

※The breathing port should be open to the atmosphere.

Table 3. Piping tightening torque of operation port

Operating port size

Recommended tightening torque (N・m)

Rc1/8

3 to 5

Piping of body

・The ferrule part dimensions are ISO compliant. Assemble using gaskets and clamps of appropriate

size.

2.4.1 Seal material

Apply a seal tape or seal material to the screw threads leaving two or more threads at the pipe end

uncovered or uncoated. If the pipe end is fully covered or coated, a shred of seal tape or residue of seal

material may enter inside of the valve and cause a failure.

When using a seal tape, wind it around the screw threads in the direction opposite from the screw

threads and press it down with your fingers to attach it firmly.

When using a liquid seal material, be careful not to apply it to resin parts. The resin parts can become

damaged and this may lead to a failure or malfunction.

Also, do not apply seal material to the internal threads.

Seal tape

Seal material (solid or liquid)

Leave

two threads

Incorrect

Correct

Incorrect

Correct

SM-50769-A/3 3. USAGE

10 2022-01-06

3. USAGE

CAUTION

Pay attention to rapid changes in fluid temperature.

Rapid changes in fluid temperature may cause internal leakage.

As for compressed air for actuator operation, use air or inert gas passed through a filter with

a filtration rating of 5 µm or more.

Use the operating air pressure within the specified pressure range.

Normally open and Double-acting valves may damage the diaphragm if pressure exceeding the

specified range is applied.

In addition, the life will be longer if the setting is low within the specified pressure range.

If the operating pressure cannot be controlled, we recommend selecting the normally closed type.

Check that the pressure port on the valve is correct.

(Normally closed：X port、Normally open：Y port、Double-acting：X port ・ Y port)

Applying pressure to the wrong operating port can cause diaphragm breakage or malfunction.

If the product has been out of use for one month or more, perform a test run before starting

actual operation.

If the product has been out of use for one month or more, completely remove any water left

in the product.

Water residue will cause rusting and may lead to malfunction or leaks.

If the residual water cannot be removed, operate the valve several times a day and pass water

through to ensure ideal use.

Observe the valve operation frequency.

The valve operation frequency is 20 times / min or less for SWD1 to SWD4 and 10 times / min or

less for SWD5.

If the operating air supply time or exhaust time is short, the valve actuation may be unable to keep

up.

If you use the product infrequently, contact CKD.

Make sure that no fluid adheres to anything other than the flow path of the product.

Pay attention to the fluid pressure and piping conditions.

Water hammer and vibration may occur in certain fluid pressure and piping conditions. In most

cases, this can be resolved by adjusting the open-close speed using a speed controller, etc. If a

problem persists, review and revise the fluid pressure and piping conditions.

Be careful of grease adhesion on the indicator.

Indicator rises during valve opening. Since grease is applied to the indicator part, be careful of

adhesion.

Do not use valves as footing or place any heavy objects on top of the valves.

SM-50769-A/3 3. USAGE

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3.1 Checks to Make Before Use (Checks Made After Mounting)

WARNING

Close the main cock and discharge the fluid in the valve before performing an appearance

check.

Appearance check

• Check that the valve is securely fixed to the piping by pressing it by hand.

• Check that the piping is secure.

• Check that the threaded parts are not loose.

• Check that the operating pressure is correct.

Operation check

• Before pressurizing the working fluid, pressurize the operating air and make sure the valve works.

You can check the valve working with the indicator on the top of the actuator.

Leakage check

• Pressurize the operating air and check for leaks from the piping connections.

• Pressurize the fluid to check for leakage from the piping connections.

SM-50769-A/3 3. USAGE

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3.2 Safety Instructions

The operating port and operating pressure differ depending on the valve model number and actuation.

See Table 4.

Table 4. Operating port and operating pressure according to operating method

SWD※1 SWD※2 SWD※3

Normally closed Normally open Double acting

X port Y port

Open：X port

Close：Y port

Y port X port

－

SWD1※-8

SWD1※-10

SWD2※-15

SWD3※-25 0.3 MPa to 0.35 MPa 0.25 MPa to 0.3 MPa

SWD4※-40 0.35 MPa to 0.4 MPa 0.3 MPa to 0.35 MPa

SWD5※-50 0.27 MPa to 0.32 MPa 0.2 MPa to 0.25 MPa

0.35 MPa to 0.7 MPa

0.25 MPa to 0.35 MPa

0.2 MPa to 0.3 MPa

0.4 MPa to 0.7 MPa

Model No. (actuation)

Actuation

Operation port

Breathing port

Model

No.

(size)

SM-50769-A/3 4. MAINTENANCE AND INSPECTION

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4. MAINTENANCE AND INSPECTION

DANGER

Thoroughly read and understand this Instruction Manual before maintenance and

inspection.

Valve performance may not be maintained if disassembled and reassembled.

Release operating air and fluid pressure before maintenance and inspection.

When replacing the valve, wash it with pure water or air before starting work.

Make sure that the remaining chemicals do not affect surrounding equipment or people. Also,

when touching the valve, please read the Material Safety Data Sheet (SDS) and wear the

necessary protective equipment.

Surely follow the "4.2 Disassembling and Assembling" replacement procedure.

Absolutely perform a test run after reassembling.

CAUTION

When replacing the product, be sure to use the product with the same model number.

Specifications may differ even if they have the same appearance.

Do not store in direct sunlight or places with high temperatures.

When handling the product, do not subject it to shocks or scratches due to throwing,

dropping, hooking, etc.

If the product has been out of use for one month or more, perform a test run before starting

actual operation.

(1) Perform daily and regular inspections to use this product in the optimum condition.

(2) Daily check

・Please refer to "3.1 Checks to Make Before Use (Checks Made After Mounting)" for the

inspection contents.

(3) Periodic inspection

・Normally, disassemble the valve once every six months and inspect the seal. Although it

depends on the conditions of use, we recommend that you replace the diaphragm once a

year. If there is no abnormality in the diaphragm during regular inspection, it can be reused,

but be careful not to change the combination of diaphragm and body.

・Since the durability of the diaphragm varies greatly depending on the type of fluid,

pressure, temperature, and operating frequency, the frequency of periodic inspections

should be performed in consideration of the customer's usage conditions.

・The durability of the actuator varies depending on the fluid temperature and air quality, so

perform regular maintenance.

4.1 Maintenance Parts

CAUTION

Disassembled or replaced products and parts, and defects caused by work are excluded

from the scope of warranty.

(1) Diaphragm

・Replace if any abnormality such as leakage, malfunction or delay is found during use.

SM-50769-A/3 4. MAINTENANCE AND INSPECTION

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4.2 Disassembling and Assembling

DANGER

Do not disassemble the actuator part.

The customer is requested to never disassemble the actuator part. It is very dangerous because

it has a built-in high-load spring. If you need to disassemble, please contact your dealer or

distributor.

WARNING

Before disassembling and assembling, release the operating air and liquid pressure to

discharge the fluid in the product.

■Before diaphragm replacement

(1) Before disassembling, be sure to release the operating air / fluid pressure and check that

no pressure is applied inside the valve.

(2) When replacing the diaphragm, replace it with pure water so that the remaining fluid does

not affect surrounding equipment and people, and purge it with dry air or an inert gas

before starting work. Also, when touching the fluid passage of the valve, read the Material

Safety Data Sheet (SDS) and wear the necessary protective equipment.

(3) The diaphragm can be replaced with the body piped, but it is recommended to replace the

diaphragm with it removed from the plumbing.

(4) Be sure to use the specified diaphragm.

■Diaphragm replacement procedure（See page 15）

①After confirming that there is no fluid or pressure, supply operating air to the X port for NC

type and double acting types, and open the valve. (See Table 4 in "3.2 Safety Instructions"

for operating pressure.)

NO type does not require pressurization.

②Remove the hexagon socket head cap screws and spring washers and remove the actuator

and diaphragm from the body.

③For NC type, exhaust the operating air and keep the valve closed. For NO type and double

acting type, supply operating air to the Y port and keep the valve closed.

(Refer to Table 4 in "3.2 Safety Instructions" for operating pressure.)

※Please be careful about the behavior of the diaphragm.

④Rotate the diaphragm 90 degrees and remove it from the compressor.

⑤Check the compressor is clean and install a new diaphragm.

After inserting the diaphragm as far as it will go, rotate it 90 degrees in the same way as

when disassembling. After rotation, make sure that the diaphragm and the actuator

mounting holes are aligned.

⑥Check that the sealing surface of the body (both internal and external seals) is free of dirt,

scratches, and foreign matter. ※These will cause leakage.

⑦In the same way as (1), supply the operating air to the X port again and open the valve.

⑧Set the actuator on the body and align the convex part of the diaphragm with the concave

part of the body.

⑨Tighten the hexagon socket head cap screws evenly. See Table 5 for tightening torque.

Tighten the screws diagonally gradually to avoid one-sided tightening. Excessive tightening

will put an excessive load on the diaphragm and shorten its life, so tighten it while checking

the torque with a torque wrench or the like.

⑩Open and close the valve and check that it operates smoothly. Pipe and pressurize the fluid

to make sure there are no leaks from the pipe.

⑪Check each time to see if the torque can be maintained even after operation.

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CKD SWD Series User manual

Brand: CKD

Model: SWD Series

Type: User manual

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CKD SWD Series User manual

CKD SWD Series User manual

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